Polish police make arrest in artist Robert ⁠Kuzovkov’s murder; Russia threatens huge ‘group strikes’ after attack on Moscow. What we know on day 1,577 Polish police make arrest in artist Robert ⁠Kuzovkov’s murder; Russia threatens huge ‘group strikes’ after attack on Moscow. What we know on day 1,577 A suspect in the fatal shooting of a Russian activist critical of Vladimir Putin has been arrested in Poland . Officials said they believe there may be a link to the man and a foreign intelligence